Tianhe-2, a supercomputer developed by China's National University of Defense Technology has retained its position as the world's No.1 system for the third consecutive time. Tianhe-2 has performance of 33.86 petaflop/s (quadrillions of calculations per second) on the Linpack benchmark, according to the 43rd edition of the twice-yearly TOP500 list of the world’s most powerful supercomputers.